Argyranthemum plant named ‘SUN 420’

ABSTRACT

A new and distinct cultivar of  Argyranthemum  plant named ‘SUN 420’, characterized by its uniformly mounded plant habit; freely branching habit; freely flowering habit; large single-type inflorescences with white-colored ray florets; and good garden performance.

Botanical designation: Argyranthemum frutescens.

Cultivar denomination: ‘SUN 420’.

BACKGROUND OF THE INVENTION

The present invention relates to a new and distinct cultivar of Argyranthemum plant, botanically known as Argyranthemum frutescens and hereinafter referred to by the cultivar name ‘SUN 420’.

The objective of the breeding program is to create new Argyranthemum plants with attractive ray and disc floret colors and good garden performance and pest resistance.

The new Argyranthemum plant originated from a cross-pollination made by the Inventor in August, 2011 in Glandorf, Germany of two unnamed seedling selections of Argyranthemum frutescens, not patented. The new Argyranthemum plant was discovered and selected by the Inventor as a single flowering plant from within the progeny of the stated cross-pollination in a controlled greenhouse environment in Glandorf, Germany in July, 2012.

Asexual reproduction of the new Argyranthemum plant by vegetative tip cuttings was first conducted in Glandorf, Germany in February, 2013. Asexual reproduction by cuttings has shown that the unique features of this new Argyranthemum plant are stable and reproduced true to type in successive generations.

SUMMARY OF THE INVENTION

Plants of the new Argyranthemum have not been observed under all possible combinations of environmental conditions and cultural practices. The phenotype may vary somewhat with variations in environmental conditions such as temperature, daylength and light intensity, without, however, any variance in genotype.

The following traits have been repeatedly observed and are determined to be the unique characteristics of the new Argyranthemum plant. These characteristics in combination distinguish ‘SUN 420’ as a new and distinct Argyranthemum plant:

-   -   1. Uniformly mounded plant habit.     -   2. Freely branching habit.     -   3. Freely flowering habit.     -   4. Large single-type inflorescences with white-colored ray         florets.     -   5. Good garden performance.

Plants of the new Argyranthemum differ from plants of the parent selections primarily in uniformity as plants of the new Argyranthemum are more uniformly mounding than plants of the parent selections.

Plants of the new Argyranthemum can be compared to plants of Argyranthemum frutescens ‘SUN 180’, not patented. In side-by-side comparisons conducted in Glandorf, Germany, plants of the new Argyranthemum differed primarily from plants of ‘SUN 180’ in ray floret color as plants of ‘SUN 180’ have pink-colored ray florets.

BRIEF DESCRIPTION OF THE PHOTOGRAPHS

The accompanying photographs illustrate the overall appearance of the new Argyranthemum showing the colors as true as it is reasonably possible to obtain in colored reproductions of this type. Colors in the photographs may differ slightly from the color values cited in the detailed botanical description which accurately describe the colors of the new Argyranthemum plant.

The photograph on the first sheet comprises a side perspective view of a typical flowering plant of ‘SUN 420’ grown in a container.

The photograph on the second sheet is a close-up view of a typical flowering plant of ‘SUN 420’.

DETAILED BOTANICAL DESCRIPTION

The aforementioned photographs and following observations and measurements describe plants grown during the spring and early summer in 9-cm containers in a glass-covered greenhouse in Glandorf, Germany and under cultural practices typical of commercial potted Argyranthemum production. During the production of the plants, day temperatures ranged from 14° C. to 28° C., night temperatures ranged from 10° C. to 18° C. and light levels ranged from 25 klux to 90 klux. Plants were pinched one time five weeks after planting and were 2.5 months old when the photographs and description were taken. In the following description, color references are made to The Royal Horticultural Society Colour Chart, 2007 Edition, except where general terms of ordinary dictionary significance are used.

-   Botanical classification: Argyranthemum frutescens ‘SUN 420’. -   Parentage:     -   -   Female, or seed, parent.—Unnamed seedling selection of             Argyranthemum frutescens, not patented.         -   Male, or pollen, parent.—Unnamed seedling selection of             Argyranthemum frutescens, not patented. -   Propagation:     -   -   Type.—Terminal cuttings.         -   Time to initiate roots, summer.—About 8 to 10 days at             temperatures about 18° C. to 24° C.         -   Time to initiate roots, winter.—About 10 to 15 days at             temperatures about 14° C. to 18° C.         -   Time to produce a rooted young plant, summer.—About 14 to 16             days at temperatures about 18° C. to 24° C.         -   Time to produce a rooted young plant, winter.—About 16 to 20             days at temperatures about 14° C. to 18° C.         -   Root description.—Fine to medium in thickness, fibrous;             typically white in color, actual color of the roots is             dependent on substrate composition, water quality,             fertilizer type and formulation, substrate temperature and             physiological age of roots.         -   Rooting habit.—Moderate branching; medium density. -   Plant description:     -   -   Plant and growth habit.—Herbaceous perennial; uniformly             mounding plant habit; upright to broadly spreading form;             overall shape, roughly flattened globular; moderately             vigorous growth habit.         -   Branching habit.—Freely branching growth habit with about             nine lateral branches developing per plant; pinching             enhances lateral branch development.         -   Plant height.—About 16.4 cm.         -   Plant width.—About 27.9 cm.         -   Lateral branches.—Length: About 7.5 cm. Diameter: About             4 mm. Internode length: About 1 cm. Strength: Strong; young             stems, flexible. Texture: Smooth, glabrous. Luster:             Moderately glossy. Color: Close to 138C; axial stripes,             close to 144B. -   Leaf description:     -   -   Arrangement.—Alternate, simple; sessile.         -   Length.—About 7.9 cm.         -   Width.—About 4.8 cm.         -   Shape.—Pinnatisect; in outline, obovate.         -   Apex.—Acute.         -   Base.—Cuneate.         -   Margin.—Deeply incised.         -   Sinuses.—Slightly divergent.         -   Texture, upper and lower surfaces.—Smooth, glabrous;             leathery.         -   Luster, upper and lower surfaces.—Matte.         -   Venation.—Pinnate.         -   Color.—Developing leaves, upper surface: Close to 143A.             Developing leaves, lower surface: Close to 143B. Fully             expanded leaves, upper surface: Close to between 136A and             N137A; venation, close to 136B. Fully expanded leaves, lower             surface: Close to 137C; venation, close to 143A. -   Inflorescence description:     -   -   Inflorescence form and arrangement.—Single-type terminal and             axillary inflorescences held above and beyond the foliar             plane on strong peduncles; ray and disc florets arranged             acropetally on a receptacle; inflorescences face mostly             upright to slightly outwardly.         -   Flowering habit.—Freely flowering habit with about 100             inflorescences developing per plant during the flowering             season.         -   Flowering season.—Plants flower from spring to late summer             in Germany; flowering continuous during this period.         -   Inflorescence longevity.—Inflorescences last about two to             three weeks on the plant; inflorescences not persistent.         -   Fragrance.—Faintly fragrant.         -   Inflorescence buds.—Height: About 7 mm. Diameter: About             8 mm. Shape: Flattened globular. Color: Towards the base,             close to 143D; towards the apex, close to 165C.         -   Inflorescence size.—Diameter: About 6.5 cm. Depth (height):             About 1.6 cm. Diameter of disc: About 1.8 cm. Receptacle             diameter: About 5 mm. Receptacle height: About 3 mm.         -   Ray florets.—Quantity per inflorescence and arrangement:             About 24 arranged in about two whorls. Length: About 3 cm.             Width: About 9 mm. Shape: Elliptic to narrowly obovate.             Apex: Shallowly praemorse. Base: Attenuate. Margin: Entire.             Texture, upper surface: Smooth, glabrous; velvety. Texture,             lower surface: Smooth, glabrous; carinate. Luster, upper             surface: Matte. Luster, lower surface: Slightly glossy.             Color: When opening, upper surface: Close to NN155A. When             opening, lower surface: Close to NN155B. Fully opened, upper             surface: Close to NN155B; color does not change with             development. Fully opened, lower surface: Close to NN155B             slightly tinged with close to 186D; color does not change             with development.         -   Disc florets.—Quantity per inflorescence and arrangement:             About 250 spirally arranged at center of receptacle. Length:             About 6 mm. Diameter, apex: About 2 mm. Diameter, base:             About 0.5 mm. Shape: Tubular with five free apical lobes.             Apex: Acute. Texture, inner and outer surfaces: Smooth,             glabrous. Luster, inner surface: Glossy. Luster, outer             surface: Matte. Color, immature, inner and outer surfaces:             Apex: Close to 175B. Mid-section: Close to 22B. Base: Close             to 145C. Color, mature, inner and outer surfaces: Apex:             Close to 12A. Base and mid-section: Close to 145C.         -   Phyllaries.—Quantity per inflorescence and arrangement:             About 20 arranged in two whorls. Length: About 4 mm. Width:             About 3 mm. Shape: Ovate. Apex: Praemorse. Base: Broadly             cuneate. Margin: Entire. Texture, upper and lower surfaces:             Smooth, glabrous; edges, papery. Luster, upper surface:             Glossy. Luster, lower surface: Matte. Color, upper surface:             Close to 144C; margins and papery edges, close to 199D.             Color, lower surface: Close to 143C; margins and papery             edges, close to 199D.         -   Peduncles.—Length, terminal peduncle: About 3.9 cm. Length,             fourth peduncle: About 7.4 cm. Diameter: About 1.75 mm.             Angle: Terminal peduncle, erect; lateral peduncles, about             40° from branch axis. Strength: Strong. Texture: Slightly             ribbed, glabrous. Luster: Slightly glossy. Color: Close to             138B.         -   Reproductive organs.—Androecium: Present on disc florets             only. Filament length: About 2.5 mm. Anther length: About             1 mm. Anther shape: Lanceolate; basifixed. Anther color:             Close to 6A. Pollen amount: Moderately high. Pollen color:             Close to 17A. Gynoecium: Present on both ray and disc             florets. Pistil length: About 4.5 mm. Stigma shape:             Decurrent. Stigma color: Close to 13B. Style length: About             4 mm. Style color: Close to 145B. Ovary color: Close to             145C.         -   Seeds and fruits.—Seed and fruit production has not been             observed on plants of the new Argyranthemum. -   Disease & pest resistance: Plants of the new Argyranthemum have not     been shown to be resistant to pathogens and pests common to     Argyranthemum plants. -   Garden performance: Plants of the new Argyranthemum have been     observed to have good garden performance and to tolerate rain, wind,     high temperatures about 40° C. and to be hardy to USDA Hardiness     Zone 9. 

It is claimed:
 1. A new and distinct Argyranthemum plant named ‘SUN 420’ as illustrated and described. 